Would heavier oil make the car slower?
07-05-2011, 12:33 PM
#2
MBWorld Fanatic!
I don't think a heavier weight oil would make the go 60-130 mph times slower. A thicker oil, would make pumping the oil up to the lifter harder. When I had a Mustang Cobra, I would run a thicker oil in the summer and a thinner in the winter. But I can't see that making in difference in the C63. I thicker oil say the consistency of maple syrup would cause engine problems, as the oil is to thick to circulate. But 10W-40 isn't that thick of a weight oil. I can't see that weight oil slowing the car down. 
07-05-2011, 05:20 PM
#3
10w40 would only be thicker than 0w40 at cold temperatures. Since they both have a '40' at the end, they are both at about the same viscosity at 100C. 10w40 provides absolutely no advantage over 0w40 (other than potential cost savings).
07-05-2011, 05:39 PM
#4
MBWorld Fanatic!
Shouldn't make a difference.
10W-40 would be better in hotter weather since thinner oil breaks down easier in hot weather.
Weather temps are around 100°F in Los Angeles and my oil temp hasnt risen above 221°F and I run 0W-40.
10W-40 would be better in hotter weather since thinner oil breaks down easier in hot weather.
Weather temps are around 100°F in Los Angeles and my oil temp hasnt risen above 221°F and I run 0W-40.
07-05-2011, 06:34 PM
#5
10w40 is only thicker than 0w40 at cold temperatures. It does not provide additional protection at typical operating temperatures. Oil grades are determined by their viscosities at 40C and 100C. Essentially each of the two values on a multigrade oil are determined at each of those temps.
As the initial value in 0w40 is less than that in 10w40, the 0w40 is less viscous than the 10w40 at 40C. Since both have 40 as their second value, they have roughly the same viscosity at 100C.
Now, here's the kicker, and oil's viscosity when drawn on a graph with temp. Along the x axis and viscosity on the y axis is linear ( with the viscosity value of the y axis on a logarithmic scale). So the lines for the two grades of oil will intersect at 100C, and beyond that, the viscosity of the 0w40 will be higher.
07-06-2011, 01:44 AM
#6
MBWorld Fanatic!
This is a common misconception.
10w40 is only thicker than 0w40 at cold temperatures. It does not provide additional protection at typical operating temperatures. Oil grades are determined by their viscosities at 40C and 100C. Essentially each of the two values on a multigrade oil are determined at each of those temps.
As the initial value in 0w40 is less than that in 10w40, the 0w40 is less viscous than the 10w40 at 40C. Since both have 40 as their second value, they have roughly the same viscosity at 100C.
Now, here's the kicker, and oil's viscosity when drawn on a graph with temp. Along the x axis and viscosity on the y axis is linear ( with the viscosity value of the y axis on a logarithmic scale). So the lines for the two grades of oil will intersect at 100C, and beyond that, the viscosity of the 0w40 will be higher.
10w40 is only thicker than 0w40 at cold temperatures. It does not provide additional protection at typical operating temperatures. Oil grades are determined by their viscosities at 40C and 100C. Essentially each of the two values on a multigrade oil are determined at each of those temps.
As the initial value in 0w40 is less than that in 10w40, the 0w40 is less viscous than the 10w40 at 40C. Since both have 40 as their second value, they have roughly the same viscosity at 100C.
Now, here's the kicker, and oil's viscosity when drawn on a graph with temp. Along the x axis and viscosity on the y axis is linear ( with the viscosity value of the y axis on a logarithmic scale). So the lines for the two grades of oil will intersect at 100C, and beyond that, the viscosity of the 0w40 will be higher.
How does the weight of the oil play a role at a cold start?
07-06-2011, 01:56 AM
#7
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2007 E63 w/P30 and Eurotech CF Diffuser
10w-40
http://www.mobil.com/USA-English/Lub...leage_Oil.aspx
0w-40
http://www.mobil.com/USA-English/Lub...l_1_0W-40.aspx
Knock yourselves out
http://www.mobil.com/USA-English/Lub...leage_Oil.aspx
0w-40
http://www.mobil.com/USA-English/Lub...l_1_0W-40.aspx
Knock yourselves out
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07-06-2011, 09:25 AM
#9
07-07-2011, 02:33 AM
#11
MBWorld Fanatic!
Exactly correct. 10-40 is not as good as 0-40. You want lighter viscosity oil at start up. If you're looking for some advantage think about 5-50 or BMW makes a M spec 0-60 oil.
07-07-2011, 09:03 AM
#12
This is not something I would recommend if you're interested in maintaining your factory warranty.
07-07-2011, 10:38 AM
#13
Super Member
A simple thing to keep in mind:
10 w(w for winter) and 40 s (summer) the second number is always the summer figure. I used to work as a grease monkey as a teenager changing oil and that is how it was explained to me.
I remember turbos in the day going with a 20w 50! My 1989 626 turbo loved it, my first car and there is no way any oil could make 1 second difference unlesss...you have no oil in the car!
10 w(w for winter) and 40 s (summer) the second number is always the summer figure. I used to work as a grease monkey as a teenager changing oil and that is how it was explained to me.
I remember turbos in the day going with a 20w 50! My 1989 626 turbo loved it, my first car and there is no way any oil could make 1 second difference unlesss...you have no oil in the car!
